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You can stay as long as you need in a hostel.
as long as they need to.
tae
You need good sleep
dolphins need to stay with there mothers for about years.
4 years
It's speed. Because if we stay in the air for to long you will just fall down. Also you need strength because that will lift you up from the wall and you will be going up.
Dogs will stay underwater as long as they need to without hurting themselves. Like humans they know when they need to come up for air.
You will need to have alot alot alot of gas in your spaceship so you can come back down if you wanted to stay up there for a long time but if you wanna stay up there until you it will take about 100,000 hours for you to die...
Forever, they just need to stay moist.
Species dependant.
Your whole life if you need to.